<template>
	<view>
		<!-- 自定义搜索组件 -->
		<my-search @clicktoSearch="toSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
				<block v-for="(item,index) in cateList" :key="index">
					<view :class="['left-scroll-view-item',index===active?'active':'']" @click="changeActive(index)">
						{{item.cat_name}}
					</view>
				</block>

			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="item2,index2 in cateLevel2" :key="index2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">
						/{{item2.cat_name}}/
					</view>
					<!-- 当前二级分类下三级分类列表 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="item3,index3 in item2.children" :key="index3"
							@click="toGoodsList(item3)">
							<!-- 三级分类图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				//当前设备可用高度
				wh: 0,
				cateList: [],
				active: 0,
				//二级分类列表
				cateLevel2: [],
				scrollTop: 0
			};
		},
		methods: {
			//获取分类列表数据
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) {
					return uni.$showMsg()
				}
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			changeActive(index) {
				this.active = index

				//重新为二级分类赋值
				this.cateLevel2 = this.cateList[index].children

				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			toGoodsList(item) {
				uni.navigateTo({
					url: `/subpkg/goods_list/goods_list?cid=` + item.cat_id
				})

			},
			toSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		},
		onLoad() {
			const systemInfo = uni.getSystemInfoSync()
			this.wh = systemInfo.windowHeight - 50
			this.getCateList()
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				background-color: #f7f7f7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;

				&.active {
					background-color: #ffffff;
					position: relative;

					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: 700;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		// justify-content: space-around;

		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>
